1. Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
2. Division of Neurology, Department of Medicine, University of Toronto, Toronto, Ontario, Canada
3. Department of Ophthalmology and Vision Sciences, University of Toronto, Toronto, Ontario, Canada
4. Kensington Vision and Research Centre, Toronto, Ontario, Canada
5. Department of Ophthalmology, St Michael’s Hospital, Toronto, Ontario, Canada